Fertility testing

After my third miscarriage they advised me to get fertility testing done. I was confused because fertility testing to me meant testing why someone couldnt conceive. Conceiving is not the issue for me. Having multiple miscarriages is my issue. I ended up making an appointment finally. Im hoping they will figure out why it keeps happening and prevent it from happening again.

Have any of you ladies been through a similar situation and finally had their rainbow baby? What should I expect through this process?